Luther trembled as he looked upon himself—one man opposed to the mightiest powers of earth. He sometimes doubted whether he had indeed been led of God to set himself against the authority of the church. “Who was I,” he writes, “to oppose the majesty of the pope, before whom ... the kings of the earth and the whole world trembled? ... No one can know what my heart suffered during these first two years, and into what despondency, I may say into what despair, I was sunk.”(177) But he was not left to become utterly disheartened. When human support failed, he looked to God alone, and learned that he could lean in perfect safety upon that all-powerful arm. To a friend of the Reformation Luther wrote: “We cannot attain to the understanding of Scripture either by study or by the intellect. Your first duty is to begin by prayer. Entreat the Lord to grant you, of His great mercy, the true understanding of His word. There is no other interpreter of the word of God than the Author of this word, as He Himself has said, ‘They shall be all taught of God.’ Hope for nothing from your own labors, from your own understanding: trust solely in God, and in the influence of His Spirit. Believe this on the word of a man who has had experience.”(178) Here is a lesson of vital importance to those who feel that God has called them to present to others the solemn truths for this time. These truths will stir the enmity of Satan, and of men who love the fables that he has devised. In the conflict with the powers of evil, there is need of something more than strength of intellect and human wisdom. When enemies appealed to custom and tradition, or to the assertions and authority of the pope, Luther met them with the Bible, and the Bible only. Here were arguments which they could not answer; therefore the slaves of formalism and superstition clamored for his blood, as the Jews had clamored for the blood of Christ. “He is a heretic,” cried the Roman zealots. “It is high treason against the church to allow so horrible a heretic to live one hour longer. Let the scaffold be instantly erected for him!”(179) But Luther did not fall a prey to their fury. God had a work for him to do, and angels of heaven were sent to protect him. Many, however, who had received from Luther the precious light, were made the objects of Satan’s wrath, and for the truth’s sake fearlessly suffered torture and death.